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Weather & Climate in St Martin, Guernsey
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
St Martin experiences four distinct seasons with an average annual temperature of 52°F (11°C). Winters average 49°F in January while summers reach 62°F in July / relatively mild seasonal variation. The area gets 241 sunny days per year, above the national average. Annual precipitation totals 42.9 inches. The city sits at an elevation of 318 feet.
Temperature
49°F Jan (9°C)
62°F Jul (16°C)
| Annual Average | 52.2°F |
| 3% below US avg | |
| January Average | 49°F (9°C) |
| July Average | 62°F (16°C) |
| Sunny Days | 241 days/yr |
Geography
| Elevation | 318 ft (97 m) |
| Area | 2.5 sq mi (6.5 km²) |
| Population Density | 0/sq mi |
| Coordinates | 49.4371°N, 2.5548°W |
| Timezone | Europe/Guernsey |
Precipitation & Snow
Air Quality
Earthquake History
81 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M4.2.
| Apr 30, 1990 | 5 km SE of Saint Helier, Jersey | M4.2 | 49 km | 22 km |
| Jul 11, 2014 | 23 km W of Saint Helier, Jersey | M3.9 | 33 km | 12 km |
| Jul 11, 2002 | 3 km NW of Pluduno, France | M3.8 | 100 km | 10 km |
| Feb 25, 2015 | 30 km SW of Saint Helier, Jersey | M3.7 | 50 km | 2 km |
| Aug 17, 1995 | 28 km S of Salcombe, United Kingdom | M3.6 | 108 km | 10 km |
| Jul 26, 1993 | 5 km ESE of Villedieu-les-Poêles, France | M3.5 | 123 km | 31 km |
| Apr 22, 1995 | 6 km E of Binic, France | M3.5 | 93 km | 10 km |
| Sep 17, 1994 | 33 km NE of Plouézec, France | M3.4 | 57 km | 10 km |
| Dec 7, 1998 | 0 km SE of Cherrueix, France | M3.4 | 112 km | 2 km |
| Jun 22, 1997 | 13 km SSE of Saint Helier, Jersey | M3.4 | 56 km | 10 km |
| Aug 29, 2001 | 5 km ENE of Saint-Lô, France | M3.3 | 116 km | 6 km |
| Jul 23, 2014 | France | M3.3 | 53 km | 2 km |
| Sep 22, 1991 | 5 km ENE of Neulliac, France | M3.3 | 147 km | 10 km |
| Jul 14, 1998 | 7 km NNE of Poullaouen, France | M3.2 | 138 km | 2 km |
| Oct 16, 1997 | 4 km ENE of Torquay, United Kingdom | M3.2 | 134 km | 10 km |
| Feb 12, 1990 | 1 km N of Lanmeur, France | M3.2 | 121 km | 10 km |
| May 30, 2001 | 3 km SW of Quintin, France | M3.2 | 120 km | 8 km |
| Apr 28, 1998 | 3 km NE of Plouha, France | M3.1 | 86 km | 2 km |
| Apr 17, 1992 | 3 km SSE of Plounévez-Quintin, France | M3.1 | 139 km | 10 km |
| Jul 13, 2006 | 12 km N of Plounéour-Trez, France | M3.1 | 149 km | 13 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tsunami History
1 tsunami recorded within 500 km. Highest wave on record: 0.4 m (1 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 2011 | PLYMOUTH, ENGLAND | Avalanche | 0.4 m | — | 122 km |
Source: NOAA/NCEI Historical Tsunami Database.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 49°F (9°C) | 4.1 in | |
| February | 43°F (6°C) | 3.2 in | Coldest |
| March | 46°F (8°C) | 2.9 in | |
| April | 48°F (9°C) | 2.1 in | |
| May | 53°F (12°C) | 2.0 in | |
| June | 58°F (14°C) | 1.9 in | |
| July | 62°F (16°C) | 1.6 in | Driest |
| August | 62°F (17°C) | 1.9 in | Warmest |
| September | 60°F (15°C) | 2.7 in | |
| October | 55°F (13°C) | 3.6 in | |
| November | 50°F (10°C) | 4.3 in | Wettest |
| December | 46°F (8°C) | 4.1 in |
St Martin has a seasonal temperature swing of 19°F / from 43°F in February to 62°F in August. Total annual precipitation is 34.4 inches, with November being the wettest month (4.3") and July the driest (1.6").